ContextFactory.h revision 533eae20118036f425f27bf0536ef0ccbb090b65 
1//===- ContextFactory.h ---------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#ifndef MCLD_MC_CONTEXTFACTORY_H
10#define MCLD_MC_CONTEXTFACTORY_H
11
12#include <mcld/LD/LDContext.h>
13#include <mcld/Support/UniqueGCFactory.h>
14#include <mcld/Support/Path.h>
15
16namespace mcld
17{
18/** \class ContextFactory
19 *  \brief ContextFactory avoids the duplicated LDContext of the same file.
20 *
21 *  MCLinker is designed for efficient memory usage. Because user can give
22 *  MCLinker the same input file many times on the command line, MCLinker must
23 *  avoid opening identical file twice.
24 *
25 *  ContextFactory is the guard to prevent redundant opening. MCLinker does not
26 *  create LDContext directly. Instead, it creates LDContext by ContextFactory.
27 *  ContextFactory returns the identical reference of LDContext if it's openend.
28 *
29 *  @see LDContext
30 *  @see UniqueGCFactoryBase
31 */
32class ContextFactory : public UniqueGCFactoryBase<sys::fs::Path, LDContext, 0>
33{
34public:
35  explicit ContextFactory(size_t pNum);
36  ~ContextFactory();
37
38  LDContext* produce();
39  LDContext* produce(const sys::fs::Path& pPath);
40};
41
42} // namespace of mcld
43
44#endif
45
46